I understand that the way to go in terms of voltage and amp control is pulsewidth modulation. That being said, not only is it expensive, but its just not as much fun to order a solution online and have it sent to your door. I like to buid things.....SO.... here goes the question
What exactly is the benefit of puse width modulation over more traditional current and voltage limiting circuits, such as potentiometers and resistors in parallel etc. I know it would be very hard to find a potentiometer in the size required, but could you do a sort of electrical transmision? say a set up for half voltage, three quarters, and full, which you could manually control? The big problem I can forsee with this is that perhaps finding resistors with that kind of power rating would be hard, and that too much power would be eaten by the resistors. But again, I dont really know these things. If someone has a good deal of electrical knowlege, please enlighten me, as not only do I want awnsers, but I want to learn the why's as well.
Also, has anybody attempted to build a pulse width modulation circuit? How did you find out what its rating was? where did you find the schematics (I found many, but for low power input and output). My latest attemt is to learn to use computer programs that simulate circuits to build a pulse width modulation for low power, and tinker with the parts to see what I can come up with. If anybody knows of any good programs that wont set me back too much, and are user friendly, I would greatly appreciate that as well.
Thanks for your time guys, and happy ebiking.